O2 and X

[Michael Lorenz <macallan%netbsd.org@localhost>]

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Hello,

accelerated X on the O2 almost works, a preliminary driver can be  
found here:
ftp://ftp.netbsd.org:/pub/NetBSD/misc/macallan/sgimips/crime_drv.so
It accelerates:
- - screen-to-screen copies
- - rectangle fills
- - colour expansion
- - image uploads
The Xserver still attempts to access video memory at times which  
doesn't work for the following reasons:
- - the framebuffer is tiled, X can't deal with that ( which is why we  
use hardware for image uploads )
- - the framebuffer uses RGBA pixels, many X programs freak out so we  
convert them from ABGR when uploading which is much more common
Anything that uses XRENDER or line drawing will produce funny  
artifacts, so for instance WindowMaker looks very wrong while twm and  
xterm look almost right and are pretty much usable.
To deal with this I'll add hardware-accelerated line drawing and  
alpha-blending. The former is trivial, the latter might take some  
poking around.
There are still a few colour expansion glitches ( sometimes rogue  
pixels appear on the right edge of characters ) and there's quite a  
bit of optimization potential, for instance we can use the memory  
transfer engine for operations that use trivial ROPs like GXcopy or  
GXset, we should use the cursor hardware directly instead of ioctl 
(WSDISPLAY_*) and so on.

Also, this driver needs the very latest crmfb committed a few minutes  
ago.

have fun
Michael 
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